31455901 has 2 divisors, whose sum is σ = 31455902. Its totient is φ = 31455900.

The previous prime is 31455889. The next prime is 31455929. The reversal of 31455901 is 10955413.

It is an a-pointer prime, because the next prime (31455929) can be obtained adding 31455901 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28879876 + 2576025 = 5374^2 + 1605^2 .

It is a cyclic number.

It is not a de Polignac number, because 31455901 - 2⁵ = 31455869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31455901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31455961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15727950 + 15727951.

It is an arithmetic number, because the mean of its divisors is an integer number (15727951).

Almost surely, 2^31455901 is an apocalyptic number.

It is an amenable number.

31455901 is a deficient number, since it is larger than the sum of its proper divisors (1).

31455901 is an equidigital number, since it uses as much as digits as its factorization.

31455901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 31455901 is about 5608.5560530318. The cubic root of 31455901 is about 315.6705326723.

The spelling of 31455901 in words is "thirty-one million, four hundred fifty-five thousand, nine hundred one".